ZHCSTD7A December 2021 – November 2023 BQ79631-Q1
PRODUCTION DATA
When device is reset or enter ACTIVE from SLEEP. MCU should perform dummy write and read to synchronize the DLL on the daisy-chain devices.
In the device reset case, if device address is not programmed in OTP. MCU must perform an auto-address. The DLL synchronization is part of the step. If device address is programmed in OTP, auto-address is not required after device reset. However, MCU should perform a dummy write and dummy read steps shown in Table 8-19, step1 and step5 to synchronize the DLL.
When device goes from SLEEP to ACTIVE using SLEEPtoACTIVE signal, the device is not reset. However, it is recommend to do a 1-data-byte dummy write and read to ensure robustness. Follow the similar dummy write and read steps in Table 21, but only write and read to OTP_ECC_DATAIN1.